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They tweeted: "Thank you for your patience whilst we, Highways East and Gray LPT dealt with loose horses on the M25. Sadly one horse died after hitting a HGV before we could shut the road, a lane is closed whilst we arrange removal so expect delays at J30."

One concerned member of the public responded to the tweet asking if the lorry driver was ok.

To which the Essex Police twitter page responded: "Fine thanks, low speed and no damage to the truck or injury to him (not nice to be involved with but not his fault though)."